So then when you look into a SC lens what color do you see reflecting back at
you
and do all MC lenses reflect green when you look into them? Seriously is this
how
you can tell how a lens is coated if they are not marked???
Thanks
Terry
ALEXSCIFI@xxxxxxx wrote:
> I am utterly certain that there is no detectable difference in weight
> or mass of SC versus MC. The reason that MC lenses "generally" out-test and
> out perform SC lenses has to do with a phenomena called "scatter"--whereby
> when light hits a lens surface, all of it does not go through! Some is
> bounced back to scatter through the other elements in the opposite direction,
> causing a reduction in contrast. Moreover this bouceback usually varies with
> frequency (color). If I recall correctly no coating results in a scatter of
> some 5 to 10 percent, sc reduces this to 1 percent or so, while MC reduces
> this to tenths of a percent.
>
> I cannot remember who discovered it but SC usually means a coating of
> Magnesium Fluoride(?), which was in and of itself a vast improvement over
> "no" coating at all! In the 70s (think Austin Powers), Pentax came up with
> what they called "Super Multi Coating" which improved on the SC still
> further! They (and Zeiss) are still regarded as the best of that technology.
>
> Alex
>
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